// license that can be found in the LICENSE file.
(() => {
- let args = ["js"];
-
// Map web browser API and Node.js API to a single common API (preferring web standards over Node.js API).
const isNodeJS = typeof process !== "undefined";
if (isNodeJS) {
- if (process.argv.length < 3) {
- process.stderr.write("usage: go_js_wasm_exec [wasm binary]\n");
- process.exit(1);
- }
-
- args = args.concat(process.argv.slice(3));
global.require = require;
-
global.fs = require("fs");
const nodeCrypto = require("crypto");
} else {
window.global = window;
- global.process = {
- env: {},
- exit(code) {
- if (code !== 0) {
- console.warn("exit code:", code);
- }
- },
- };
-
let outputBuf = "";
global.fs = {
constants: {},
const encoder = new TextEncoder("utf-8");
const decoder = new TextDecoder("utf-8");
- let mod, inst;
- let values = []; // TODO: garbage collection
-
- const mem = () => {
- // The buffer may change when requesting more memory.
- return new DataView(inst.exports.mem.buffer);
- }
-
- const setInt64 = (addr, v) => {
- mem().setUint32(addr + 0, v, true);
- mem().setUint32(addr + 4, Math.floor(v / 4294967296), true);
- }
+ global.Go = class {
+ constructor() {
+ this.argv = [];
+ this.env = {};
+ this.exit = (code) => {
+ if (code !== 0) {
+ console.warn("exit code:", code);
+ }
+ };
- const getInt64 = (addr) => {
- const low = mem().getUint32(addr + 0, true);
- const high = mem().getInt32(addr + 4, true);
- return low + high * 4294967296;
- }
+ const mem = () => {
+ // The buffer may change when requesting more memory.
+ return new DataView(this._inst.exports.mem.buffer);
+ }
- const loadValue = (addr) => {
- const id = mem().getUint32(addr, true);
- return values[id];
- }
+ const setInt64 = (addr, v) => {
+ mem().setUint32(addr + 0, v, true);
+ mem().setUint32(addr + 4, Math.floor(v / 4294967296), true);
+ }
- const storeValue = (addr, v) => {
- if (v === undefined) {
- mem().setUint32(addr, 0, true);
- return;
- }
- if (v === null) {
- mem().setUint32(addr, 1, true);
- return;
- }
- values.push(v);
- mem().setUint32(addr, values.length - 1, true);
- }
+ const getInt64 = (addr) => {
+ const low = mem().getUint32(addr + 0, true);
+ const high = mem().getInt32(addr + 4, true);
+ return low + high * 4294967296;
+ }
- const loadSlice = (addr) => {
- const array = getInt64(addr + 0);
- const len = getInt64(addr + 8);
- return new Uint8Array(inst.exports.mem.buffer, array, len);
- }
+ const loadValue = (addr) => {
+ const id = mem().getUint32(addr, true);
+ return this._values[id];
+ }
- const loadSliceOfValues = (addr) => {
- const array = getInt64(addr + 0);
- const len = getInt64(addr + 8);
- const a = new Array(len);
- for (let i = 0; i < len; i++) {
- const id = mem().getUint32(array + i * 4, true);
- a[i] = values[id];
- }
- return a;
- }
+ const storeValue = (addr, v) => {
+ if (v === undefined) {
+ mem().setUint32(addr, 0, true);
+ return;
+ }
+ if (v === null) {
+ mem().setUint32(addr, 1, true);
+ return;
+ }
+ this._values.push(v);
+ mem().setUint32(addr, this._values.length - 1, true);
+ }
- const loadString = (addr) => {
- const saddr = getInt64(addr + 0);
- const len = getInt64(addr + 8);
- return decoder.decode(new DataView(inst.exports.mem.buffer, saddr, len));
- }
+ const loadSlice = (addr) => {
+ const array = getInt64(addr + 0);
+ const len = getInt64(addr + 8);
+ return new Uint8Array(this._inst.exports.mem.buffer, array, len);
+ }
- global.go = {
- async compileAndRun(source) {
- await go.compile(source);
- await go.run();
- },
+ const loadSliceOfValues = (addr) => {
+ const array = getInt64(addr + 0);
+ const len = getInt64(addr + 8);
+ const a = new Array(len);
+ for (let i = 0; i < len; i++) {
+ const id = mem().getUint32(array + i * 4, true);
+ a[i] = this._values[id];
+ }
+ return a;
+ }
- async compile(source) {
- mod = await WebAssembly.compile(source);
- },
+ const loadString = (addr) => {
+ const saddr = getInt64(addr + 0);
+ const len = getInt64(addr + 8);
+ return decoder.decode(new DataView(this._inst.exports.mem.buffer, saddr, len));
+ }
- async run() {
- let importObject = {
+ this.importObject = {
go: {
// func wasmExit(code int32)
"runtime.wasmExit": (sp) => {
- process.exit(mem().getInt32(sp + 8, true));
+ this.exit(mem().getInt32(sp + 8, true));
},
// func wasmWrite(fd uintptr, p unsafe.Pointer, n int32)
const fd = getInt64(sp + 8);
const p = getInt64(sp + 16);
const n = mem().getInt32(sp + 24, true);
- fs.writeSync(fd, new Uint8Array(inst.exports.mem.buffer, p, n));
+ fs.writeSync(fd, new Uint8Array(this._inst.exports.mem.buffer, p, n));
},
// func nanotime() int64
},
}
};
+ }
+
+ async run(instance) {
+ this._inst = instance;
+ this._values = [undefined, null, global, this._inst.exports.mem]; // TODO: garbage collection
- inst = await WebAssembly.instantiate(mod, importObject);
- values = [undefined, null, global, inst.exports.mem];
+ const mem = new DataView(this._inst.exports.mem.buffer)
// Pass command line arguments and environment variables to WebAssembly by writing them to the linear memory.
let offset = 4096;
const strPtr = (str) => {
let ptr = offset;
- new Uint8Array(inst.exports.mem.buffer, offset, str.length + 1).set(encoder.encode(str + "\0"));
+ new Uint8Array(mem.buffer, offset, str.length + 1).set(encoder.encode(str + "\0"));
offset += str.length + (8 - (str.length % 8));
return ptr;
};
- const argc = args.length;
+ const argc = this.argv.length;
const argvPtrs = [];
- args.forEach((arg) => {
+ this.argv.forEach((arg) => {
argvPtrs.push(strPtr(arg));
});
- const keys = Object.keys(process.env).sort();
+ const keys = Object.keys(this.env).sort();
argvPtrs.push(keys.length);
keys.forEach((key) => {
- argvPtrs.push(strPtr(`${key}=${process.env[key]}`));
+ argvPtrs.push(strPtr(`${key}=${this.env[key]}`));
});
const argv = offset;
argvPtrs.forEach((ptr) => {
- mem().setUint32(offset, ptr, true);
- mem().setUint32(offset + 4, 0, true);
+ mem.setUint32(offset, ptr, true);
+ mem.setUint32(offset + 4, 0, true);
offset += 8;
});
- try {
- inst.exports.run(argc, argv);
- } catch (err) {
- console.error(err);
- process.exit(1);
- }
+ this._inst.exports.run(argc, argv);
}
}
if (isNodeJS) {
- go.compileAndRun(fs.readFileSync(process.argv[2])).catch((err) => {
+ if (process.argv.length < 3) {
+ process.stderr.write("usage: go_js_wasm_exec [wasm binary] [arguments]\n");
+ process.exit(1);
+ }
+
+ const go = new Go();
+ go.argv = process.argv.slice(2);
+ go.env = process.env;
+ go.exit = process.exit;
+ WebAssembly.instantiate(fs.readFileSync(process.argv[2]), go.importObject).then((result) => {
+ return go.run(result.instance);
+ }).catch((err) => {
console.error(err);
process.exit(1);
});